<?php
    class meta{
        
        function get( $postID , $metakey , $index = -1 )
        {   
            $metakey = 'mythemes-' . $metakey;
            
            $meta = get_post_meta( $postID , $metakey , true );
            
            if( $index  != -1 ){
                if( isset( $meta[ $index ] ) ){
                    $meta = $meta[ $index ];
                }else{
                    $meta = null;
                }
            }

            return $meta;
        }
        
        function set( $postID , $metakey , $value )
        {   
            $metakey = 'mythemes-' . $metakey;
            return update_post_meta( $postID , $metakey , $value );
        }
    }
?>